Abstract
The distribution of radial (U) and rotational (V) velocities of red clump giants was studied as a function of their heights above the galactic plane. The stars of this type were selected from the compiled catalogue of stellar proper motions and infrared photometry at the north galactic pole with the use of the diagram “color-reduced proper motion.” According to the data on 1800 red clump giants located at heights from 1 to 3 kpc (mostly thick disk stars), mean kinematic parameters of the thick disk were determined: U 0 = −18 ± 2 km/s, V 0 = −56 ± 1 km/s, σ U = 72 ± 2 km/s, and σ V = 58 ± 1 km/s. The velocity of asymmetric drift V 0 and velocity variances σ U , σ V are shown to depend on heights above the galactic plane.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
S. P. Rybka and A. I. Yatsenko, “Compiled Catalog of the Proper Motions and Infrared Photometry of Stars at the North Galactic Pole,” Kinem. Fiz. Neb. Tel 24, 238–244 (2008) [Kinem. Phys. Cel. Bodies 24, 176 (2008)].
Prieto C. Allende, T. C. Beers, W. Ronald, et al., “A Spectroscopic Study of the Ancient Mikey Way: Fand G-Type Stars in the Third Data Release of the Sloan Digital Sky Survey,” Astrophys. J., Suppl. Ser. 636, 804–820 (2006).
D. R. Alves, “K-Band Calibration of the Red Clump Luminosity,” Astrophys. J. 539, 732–731 (2000).
A. Cabrera-Lavers, S. Bilir, S. Ak, et al., “Estimation of Galactic Model Parameters in High Latitudes with 2MASS,” Astron. Astrophys. 464, 565–572 (2007).
W. Dehnen and J. Binny, “Local Stellar Kinematics from HIPPARCOS Data,” Mon. Not. R. Astron. Soc. 298, 387–394 (1998).
M. W. Feast and P. A. Whitelock, “HIPPARCOS Parallaxes and Proper Motions of Cepheids and Their Implications,” in Proc. of the ESA Symp. “Hipparcos-Venice 97,” Ed. by B. Battrick (ESA, Noordwijk, 1997), pp. 625–628.
T. M. Girard, V. I. Korchagin, D. I. Casetti-Dinesku, et al., “Velocity Shear of the Thick Disk from SPM3 Proper Motion at the South Galactic Pole,” Astron. J. 132, 1768–1782 (2006).
D. R. H. Johnson and D. R. Soderblom, “Calculating Galactic Space Velocities and Their Uncertainties with an Application to the Ursa Major Group,” Astron. J. 93, 864–867 (1987).
M. Lopez-Corredoira, A. Cabrera-Lavers, F. Garxon, et al., “Old Stellar Galactic Siscs in Near Plane Regions According to 2MASS: Scales, Cut-off, Flare, and Warp,” Astron. Astrophys. 394, 883–900 (2002).
S. R. Majewski, “A Complete Multicolor Survey of Absolute Proper Motion to B 22.5: Galactic Structure and Kinematics at the North Galactic Pole,” Astrophys. J., Suppl. Ser. 78, 87–152 (1992).
C. Soubiran, “Kinematics of the Galaxy’s Stellar Populations from a Proper Motion Surveys,” Astron. Astrophys. 274, 181–188 (1993).
C. Soubiran, O. Bienayme, and A. Siebert, “Vertical Distribution of Galactic Disk Stars. I. Kinematics and Metallicity,” Astron. Astrophys. 398, 141–151 (2003).
Author information
Authors and Affiliations
Additional information
Original Russian Text © S.P. Rybka, A.I. Yatsenko, 2009, published in Kinematika i Fizika Nebesnykh Tel, 2009, Vol. 25, No. 6, pp. 463–473.
About this article
Cite this article
Rybka, S.P., Yatsenko, A.I. Thick disk kinematics from data on red clump giants at the north galactic pole. Kinemat. Phys. Celest. Bodies 25, 309–314 (2009). https://doi.org/10.3103/S0884591309060038
Received:
Published:
Issue Date:
DOI: https://doi.org/10.3103/S0884591309060038